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Analog Devices Inc. LTC3111IDE#TRPBF
- Part No.:
- LTC3111IDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3111IDE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1.5A 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,868
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Product details
Overview
LTC3111IDE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter with 2.5V–15V input/output range, 1.5A continuous output current at 5V, 800kHz fixed-frequency PWM operation, and selectable Burst Mode® for ultra-low quiescent current. It enables regulated power delivery where VIN may be above, below, or equal to VOUT-ideal for multi-cell battery systems, backup capacitor supplies, and RF transmitter rails.
For engineers reviewing the LTC3111IDE#TRPBF datasheet, LTC3111IDE#TRPBF pinout, LTC3111IDE#TRPBF application, or LTC3111IDE#TRPBF equivalent, key selection criteria include its seamless buck-boost transition, accurate RUN-pin UVLO programming (1.15V enable threshold), 49µA no-load quiescent current in Burst Mode®, and thermally enhanced 14-lead DFN package with exposed PGND pad.
Technical Context
The LTC3111IDE#TRPBF implements a proprietary 4-switch, single-inductor architecture that dynamically reconfigures internal N-channel MOSFETs (SW1/SW2/BST1/BST2) to operate in buck, boost, or buck-boost mode without inductor current discontinuity. Its voltage-mode control loop uses an error amplifier with COMP/ FB compensation and adaptive gain scaling based on operating mode.
It integrates dual UVLO circuits (VIN and VCC), programmable RUN-pin thresholds with 120mV hysteresis, thermal shutdown at ~175°C, and independent input current limit (3A typ), peak current limit (5.8A), reverse current limit (–1A), and Burst Mode zero-current threshold (0.1A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input/Output Range | 2.5V to 15V - supports single/dual/triple Li-ion, alkaline/NiMH, wall adapters, and supercapacitor backup sources without external level-shifting. |
| Continuous Output Current | 1.5A at VIN ≥ 5V, VOUT = 5V in PWM mode - sufficient for powering RF transceivers, industrial sensors, and embedded microcontrollers. |
| Switching Frequency | 800kHz nominal, synchronizable 600kHz–1.5MHz - enables compact magnetics and EMI filtering while avoiding AM radio band. |
| Quiescent Current | 49µA in Burst Mode® - extends battery life in always-on IoT endpoints and low-duty-cycle telemetry devices. |
| Efficiency | Up to 95% - achieved via low RDS(ON) internal switches (90mΩ SW1, 105mΩ SW2/BST1/BST2) and optimized gate drive. |
| RUN Pin Threshold | 1.15V (rising) enable, 1.08V (falling) disable - allows precise, resistor-programmable input undervoltage lockout for system brownout protection. |
| Shutdown Current | <1µA - ensures minimal leakage during deep sleep or storage, critical for long-life battery-powered equipment. |
Pinout & Package
Package: 14-lead (3mm × 4mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 15), rated for –40°C to 125°C junction temperature (I-grade). Thermal resistance θJA = 43°C/W; exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SGND (Pin 1) | Signal Ground Reference | Return path for RUN and FB divider networks; must be isolated from PGND until star-point connection to avoid noise coupling into feedback loop. |
| PWM/SYNC (Pin 2) | Mode Control & Sync Input | DC voltage <0.5V forces Burst Mode®; >1.5V enables 800kHz PWM; 600kHz–1.5MHz square wave overrides internal oscillator. |
| VCC (Pin 3) | Internal Regulated Supply | Internally regulated ~4.2V supply for gate drivers and logic; can be powered from VIN or external source up to 5.5V; bypass with 1µF ceramic. |
| NC (Pin 4) | No Connect | Internally unconnected; must be tied to GND per datasheet to minimize noise pickup and ensure mechanical stability. |
| VOUT (Pin 5) | Regulated Output Node | Delivers stable output; requires local 22µF low-ESR ceramic capacitor with short ground return to suppress high-frequency ripple. |
| SW2 (Pin 6) | Inductor Switch Node 2 | Connects to one end of external inductor and internal switches C/D; voltage swings between VOUT and GND in boost/buck-boost modes. |
| BST2 (Pin 7) | Floating Boost Supply for D-Switch | Requires 0.1µF capacitor to SW2 to generate gate drive voltage > VOUT for high-side D-MOSFET in boost configuration. |
| COMP (Pin 8) | Error Amplifier Output | Drives external Type III compensation network (RFB/CPOLE/RFF/CFF) to stabilize control loop across full VIN/VOUT range. |
| FB (Pin 9) | Feedback Voltage Input | Senses resistor divider (R1/R2) from VOUT; regulates output using 0.8V reference; leakage <50nA preserves accuracy at light loads. |
| SNSGND (Pin 10) | Sense Ground Return | Dedicated low-impedance return for current-sensing paths; must connect directly to PGND near exposed pad to avoid sensing errors. |
| RUN (Pin 11) | Enable/UVLO Programming Input | Resistor-divider from VIN sets turn-on (1.15V) and turn-off (1.08V) thresholds; hysteresis prevents chatter during brownout recovery. |
| VIN (Pin 12) | Main Input Supply | Accepts 2.5V–15V; requires ≥10µF low-ESR/low-ESL ceramic capacitor placed adjacent to pin with shortest possible ground path. |
| SW1 (Pin 13) | Inductor Switch Node 1 | Connects to other end of external inductor and internal switches A/B; voltage swings between VIN and GND in buck/buck-boost modes. |
| BST1 (Pin 14) | Floating Boost Supply for A-Switch | Requires 0.1µF capacitor to SW1 to generate gate drive voltage > VIN for high-side A-MOSFET in buck configuration. |
| PGND (Exposed Pad) | Power Ground Return | Primary thermal and current return path; must be soldered with multiple vias to inner-layer ground plane for θJC = 5°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless Buck-Boost Transition | Proprietary 4-switch algorithm maintains continuous inductor current across VIN/VOUT crossover-eliminates output glitches during battery discharge or load transients. |
| Programmable RUN-Pin UVLO | Accurate 1.15V rising threshold with 120mV hysteresis enables custom brownout protection without external comparators or resistors beyond basic divider. |
| Ultra-Low Quiescent Current | 49µA in Burst Mode® extends runtime in battery-backed memory, real-time clocks, and wireless sensor nodes operating at <1% duty cycle. |
| Output Disconnect in Shutdown | Internal switches isolate VOUT from VIN when disabled-prevents back-powering of upstream circuitry and preserves battery charge during system sleep. |
| Thermal Shutdown with Hysteresis | Disables all power devices at ~175°C and auto-restarts at ~170°C-protects against sustained overload or poor PCB thermal design without requiring external thermal management. |
Applications
| Portable Medical Sensors | RF Power Amplifier Rails |
|---|---|
Use Scenario: Wearable ECG monitor powered by two-series Li-ion cells (6V–8.4V) supplying 3.3V to ADC and BLE radio while maintaining regulation as battery discharges below 3.3V. IC Role / Device Role / Timing Role: Synchronous buck-boost regulator delivering stable 3.3V output regardless of input voltage crossing 3.3V during discharge. Use Value: Eliminates need for separate buck and boost converters; reduces BOM count and PCB area while ensuring uninterrupted sensor data acquisition. | Use Scenario: LTE/5G small-cell base station PA requiring 5V rail from 12V intermediate bus, with burst-mode efficiency critical during low-traffic periods. IC Role / Device Role / Timing Role: High-efficiency 5V buck-boost converter operating in Burst Mode® at idle and PWM at transmit bursts. Use Value: Achieves 95% peak efficiency and 49µA quiescent current-reducing thermal load and extending uptime in fanless enclosures. |
| Industrial Backup Power Systems | Military Ruggedized Radios |
Use Scenario: Programmable logic controller with supercapacitor backup maintaining 5V output during AC mains failure, accepting 2.5V–15V from capacitor bank or auxiliary 12V supply. IC Role / Device Role / Timing Role: Wide-range buck-boost regulator enabling single-rail backup architecture without voltage translation stages. Use Value: Simplifies power architecture, improves reliability over diode-OR solutions, and supports fast capacitor recharge via bidirectional capability. | Use Scenario: Handheld tactical radio using three-series Li-ion (9V–12.6V) to generate 5V and 3.3V rails, operating in extreme ambient temperatures (–40°C to +85°C). IC Role / Device Role / Timing Role: I-grade buck-boost converter with guaranteed –40°C to 125°C operation and robust UVLO/thermal protection. Use Value: Ensures reliable startup and regulation across full military temperature range without derating or external thermal compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.5V–12V input, 2A output, 2.5MHz switching, no SYNC pin, lower max VOUT (5.5V) | Optimized for space-constrained consumer wearables; lacks programmable RUN UVLO and wide 15V VOUT capability | Select when board area is critical and output voltage ≤5.5V suffices; verify thermal performance at 2A continuous load. |
| MAX20406AEEA+T | 2.5V–16V input, 2A output, 2.2MHz, integrated inductor option, higher quiescent current (120µA) | Targets automotive infotainment with AEC-Q200 qualification; no Burst Mode®, less suitable for ultra-low-power battery apps | Prefer for automotive environments requiring qualification; avoid where sub-50µA quiescent current is mandatory. |
Compared with TPS63020DSJR and MAX20406AEEA+T, the LTC3111IDE#TRPBF offers superior input/output voltage flexibility (2.5V–15V), precise RUN-pin UVLO programming, and lowest quiescent current-making it optimal for industrial, medical, and military systems demanding wide-range regulation and long battery life.
Availability
LTC3111IDE#TRPBF is available at Aetrix Electronics and suitable for portable medical sensors, RF power amplifier rails, and industrial backup power systems requiring stable component supply, extended temperature operation, and high reliability under variable input conditions.
Supply support for LTC3111IDE#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and continues its legacy of high-performance analog, power management, and mixed-signal ICs for precision, industrial, and aerospace applications.
The LTC3111IDE#TRPBF belongs to Linear's high-efficiency buck-boost regulator product line, designed specifically for applications where input voltage may fall above, below, or equal to the required output-enabling simplified power architectures in battery-powered and wide-input industrial systems.
FAQ
What is the maximum continuous output current specification for the LTC3111IDE#TRPBF?
The LTC3111IDE#TRPBF delivers 1.5A continuous output current when VIN ≥ 5V and VOUT = 5V in PWM mode. This rating assumes proper thermal design with the exposed PGND pad soldered to a multilayer PCB ground plane. At lower input voltages or higher output voltages, current capability decreases due to power dissipation limits and internal current limiting (3A typical input limit, 5.8A peak limit). Derating curves are provided in the datasheet Figure G01.
Does the LTC3111IDE#TRPBF support synchronization to an external clock signal?
Yes, the LTC3111IDE#TRPBF supports external frequency synchronization via the PWM/SYNC pin. Applying a square-wave signal between 600kHz and 1.5MHz overrides the internal 800kHz oscillator. The signal must maintain minimum high and low times of 100ns each. This capability enables EMI reduction through spread-spectrum-like frequency dithering or precise timing alignment with system clocks in synchronized power domains.
How does the RUN pin function on the LTC3111IDE#TRPBF, and what is its threshold voltage?
The RUN pin on the LTC3111IDE#TRPBF provides both enable/disable control and programmable input undervoltage lockout (UVLO). It enables the device when voltage rises above 1.15V (typical, ±30mV) and disables it when falling below 1.08V (typical), providing 120mV hysteresis. A resistor divider from VIN to SGND sets the exact threshold. Tying RUN directly to VIN enables the part continuously, subject to absolute maximum ratings.
What package type and thermal characteristics apply to the LTC3111IDE#TRPBF?
The LTC3111IDE#TRPBF uses a 14-lead (3mm × 4mm × 0.75mm) plastic DFN package with an exposed PGND pad (Pin 15). Its thermal resistance is θJA = 43°C/W and θJC = 5°C/W. To achieve rated performance, the exposed pad must be soldered to the PCB ground plane using multiple thermal vias. Failure to do so will significantly degrade thermal performance and may trigger thermal shutdown under moderate load.
Can the LTC3111IDE#TRPBF regulate output voltage when input voltage is lower than the output voltage?
Yes, the LTC3111IDE#TRPBF is explicitly designed for this condition. Its 4-switch buck-boost topology enables seamless regulation when VIN is below VOUT (boost mode), above VOUT (buck mode), or equal to VOUT (buck-boost boundary). With input and output ranges spanning 2.5V to 15V, it maintains stable output across the full crossover region without interruption or mode-switching artifacts-critical for battery-powered systems undergoing discharge.
LTC3111IDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 15V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 800kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3111IDE#TRPBF FAQ
1.How can I place an order for LTC3111IDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3111IDE#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3111IDE#TRPBF reliable?
The price and inventory of LTC3111IDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3111IDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3111IDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3111IDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3111IDE#TRPBF?
LTC3111IDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3111IDE#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3111IDE#TRPBF?
For technical support, including LTC3111IDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3111IDE#TRPBF requirements.
6.How does Aetrix verify that LTC3111IDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3111IDE#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3111IDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3111IDE#TRPBF?
All LTC3111IDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3111IDE#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3111IDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3111IDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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